Andreas Sauer and Naoyuki Iwashige
Application Engineering Dept., Voith IHI Paper Technology Co., Ltd.
Screening is a decisive process stage for removing contaminants
from fiber pulp. Different tools are necessary for different kind
of tasks. It starts with the question “what should be screened" -primary
or secondary fibers (brown or white) and “what contaminants" like
coarse, fine disturbing components or shives or stickies. For each
screening task, different kinds of screens are necessary. But what
are the big influences on quality and what kind of impact do they
have on a screen? It is common to discuss hole sizes and slot width.
But beyond that discussion, several other points have to be taken
In Europe new advanced screening concepts have been developed
recently. The new concepts are using “Tandem Systems" with
Feed Forward. Beyond that Intermediate Screening are used instead
of Middle Consistency
Screening Systems. Therefore a high variety of pre/ and fine screening
arrangements are in operation in DIP Systems. They always compromises
between maximum cleanliness efficiency, minimal fiber losses and
investment costs. This presentation pick up some of the most advanced
combinations and investigates the investment costs and performances.
Due to the development of the new LP Screen new concepts for the
OCC Line are also introduced.
Forerunner for Next Generation Canvas Cleaner
Canvas cleaner-project KGK Engineering Group
With ever increasing use of recycled papers, the maintenance
of a stable quality of papers is the hot issue the paper industry
is facing right now. Several issues are related in this regard.
However, keeping dryer canvases clean is one of the on going
The methods of dryer canvas cleaning is very diversified, such
as from shower cleaning methods with lots of clean water consumption,
to traversing cleaning head systems between FS and BS to get
the benefit of all-over cleaning. However, none of them has ever
reached the level of total completion.
We enjoy a very experienced history over handling canvas cleaner
systems as the very first company ever introduced the canvas
cleaner system into the PPI industry in Japan. The machine speed
has achieved a surprise increase from 800m/min level of 1970
to 2000m/min level of the present. This has made possible with
the paper machine development from fourdrinier former, to on-top
former and further to gap formers(with better effect of no-draw).
Together with it, the machine width has increased remarkably.
With this ever increasing machine speed and widening machine
width, the hiking usage of recycled paper has ever spot lighted
the issue of dirty dryer canvases which works very bad to deteriorate
the paper quality.
Mono-screw Pump which is Advantage in View of Maintenance
- Mono-screw Pump which is Long Interval Time between Maintenance
and Easy Disassembling
and Reassembling -
ENGINEERING DIV., IWAKI CO., LTD.
Mono-screw pump is well known. The most important feature of the
mono-screw pump introduced here is double shaft construction of five
year guaranteed flexishaft and pump shaft. This construction enables
long interval between maintenance and easy disassembling and reassembling
at the time of maintenance and inspection.
In addition to above mentioned feature, another feature is the long life for
whole pump because the user can select suitable coating of rotor according to
pumped liquid and because reliable mechanical seal is employed in cooperation
with mechanical seal manufacturer. Most of users of this pump do not do the maintenance
works except replacement of rotor and stator.
Generally used pin joint or gear joint needs periodical maintenance works, above
all, qualified worker is needed to disassemble and reassemble the gear joint.
Mono pump does not need qualified person to be disassembled and reassembled,
and inside company person can do the maintenance works for small size to large
size pump. Furthermore, interval time between maintenance for whole pump can
be shortened by selecting suitable parts, which saves the cost for maintenance
such as spare parts cost and personnel expenses.
Study of Less-dirt Parts for Paper Machines
Junji Taguchi, Norio Fujita and Keiji Nakai
Nomura Plating Co., Ltd.
Research Institute for Applied Science
In recent years, rolls contaminated easily during the machine
operation causes serious defects on paper.
It was found out that an excellent plating with the hydrophobicity
and durability .It was superior to fluoroethylen resin that is
hard to be contaminated, as a result.
It was found to improve the coating paper quality by appling
a metering rod for a coater machine on paper machine’s equipment.
On the other hand, it will be applied the cover of various rolls
for easy relies contaminant.
Papermakers Experience with Improved Talcs for Pitch and Stickies
Control in Europe and North America
Nihon Mistron Co., Ltd.
J. Yordan, V. Lasmarias, P. Biza and G. Williams
Modern papermaking requires modern additives, especially with
the growing importance of environmental protection, the need
to improve cost efficiency and safe product handling. Talc is
the natural product for the paper industry with three main properties,
hydrophobic/organophilic surface, softness and platy structure.
Most talc applications are based on the improved quality or reduced
cost talc offers to the end users. The fact that talc is chemically
inert makes it safe for handling and application as well as an
environmental friendly product.
In this paper the experience with novel surface-treated talcs
in six European, North and South America paper mills is presented.
More specifically, there experiences describe the successful
control of pitch and stickies obtained with two types of surface-treated
talcs at four newsprint mills, a fine paper mill and mechanical
(TMP and groundwood) and recycled pulps or combinations thereof.
Development of New Pigment which Gives High Opacity
Motoshi Tamura, Noriaki Matsuda and Kazuyuki Hosoi
SHIRAISHI KOGYO KAISHA, LTD.
In the paper manufacture industry, precipitated calcium carbonate
(PCC) and titanium dioxide (TiO2) have been widely used as a filler
in order to improve whiteness and opacity of paper for many years.
TiO2 is an expensive product and has a problem, which is low one-pass
retention in paper making process compared with PCC.
Recently, the composite of TiO2 and PCC has been researched by various
methods in order to improve retention and optical properties such
as opacity and brightness.
“Valkofil” is our new Pigment combined with TiO2 and PCC using our
unique process. Valkofil is able to give higher opacity and Light
Scattering coefficient (L.S.C) to paper than conventional PCC.
Stabilized Bromine - A New Technology for Alkaline Microbiological
Gray W Johnson
Nalco Pacific Pte Ltd., Singapore
The global movement to neutral-alkaline papermaking has increased
pressure on microbiological control in the wet end. Over the
past decade, in an effort to improve program effectiveness and
to reduce costs, the widespread utilization of halogenated oxidizing
biocides has brought with it additional operational problems
such as increased corrosion, chemical attack of other wet end
additives and paper machine clothing, and increasing environmental
concerns about the discharge of AOX. A new stabilized bromine
based biocide that releases halogen slowly has demonstrated;
both rapid kill and persistency; compatibility with other additives,
reduced corrosion, and has the potential to reduce the dosage
of other more harmful biocides.
Advanced Winder Adviser Controlling to a Winder Operation
Cognex K. K.
The results of Advanced Winder Advisor (AWA) system are highlighted.
AWA can control to a winder accurately, using inspection data and
synchronization by SmartView Paper web Inspection system. The results
are (1) Stopping at desired defects within ±10 cm, (2) Reduce winder
SmartView and Advanced Winder Advisor package allow users to have
best performance of inspection and winder operation.
“Visualization of Operations” and “Integration of Operation Environment”
Manabu Doji and Yutaka Makino
Advanced Automation Company･Yamatake Corporation
Since introduction of Distributed Control System (DCS), plant and
process controls are automated and operations became central controls.
However there are a lot of field operations as ever for various reasons.
In the situation operators of baby-boom generation who play a key
role in the field are ageing. It is certain that generational shift
from experienced operators to younger proceeds. It is a critical
issue that next generation takes over the know-how of experienced
operators in order to maintain safety and stable plant operations.
Because of the central control architecture of traditional DCS,
the functions were not sufficient to assist in field operations.
Yamatake offers “OperationAnywhere” as a new generation concept that
realizes Operations freely without restrictions of space. “The visualization
of operations” means to catch the field conditions from office or
remote place and the producing status of whole plant include other
process. “The Integration of operating environments” means to operate
of separate systems at the same time through the single Windows terminal
and to minimize costs for the investment as compared with before.
We introduce the detail of concept “OperationAnywhere” and that
Experience with Modern RCF Line Producing Stock for Industrial
The environmental and economic benefits of using recycled raw materials
are becoming increasingly self-evident to many different industries.
For this reason a growing number of paper and board manufacturers
globally are now favoring recovered fibers as raw materials. And
as the recovery rate increases, the use of recovered paper and board
is also seeing an upward trend. There are already signs that there
is a shortage of good quality recovered raw materials in certain
parts of the world.
Increasing raw material use and price, transport costs, and deteriorating
raw material quality will all affect a mill’s productivity. Ultimately,
design of the RCF line and its ability to handle a higher content
of impurities will determine the future cost-effectiveness of the
entire mill. Technological developments enable the use of lower
grade furnishes, while producing final products with improved quality.
Many mills all over the world have been investing recently and
some are currently planning to invest in new industrial-grade lines.
Many decisions are based on the current situation where, for example,
it is possible to use 100% good quality OCC as raw material.
The situation will change, however, in the future and this in turn
influences mills in many ways. Lines must start using very high
percentages of mixed waste. Some will even go up to 100% low quality
mixed waste. The equipment chosen today dictates how well a new
OCC/MW line will be able to cope with this wide range of raw materials
in the future.
In this paper, a very simple but also very effective solution is
presented for a modern industrial-grade RCF line.
Results are also provided from several mill installations and pilot
The main target is early removal of contaminant and a minimum of
equipment to reach the required quality. The pulping stage is the
first and most important stage of the line. Pulping will dictate
the pulp properties, impurities content following pulping, and operation
of the entire line.
Report of the 13 International Symposium on Wood, Fiber and Pulping Chemistry (13 ISWFPC)
The University of Tokyo
Symposium on Wood, Fiber and Pulping Chemistry (13 ISWFPC) was held at Sky City Convention Centre in Auckland,
New Zealand as the joint symposium of 59th APPITA Annual Meeting.
Main topics of this symposium are pulping and bleaching chemistry.
About 200 papers including 99 oral papers were presented at
11 sessions of pulping and bleaching chemistry, cellulose chemistry,
surface chemistry, biosynthesis and chemical structure and so
on. Forty nine papers including 22 poster papers were in the
field of pulping and bleaching chemistry, which were largest
number among all sessions.
Optimum Design of Flute Structure for Edgewise Compression of
Eiichi Mikami, Takamasa Ibaraki and Isao Kodaka
Pulp & Paper Research Laboratory, Oji Paper Co., Ltd.
Corrugated containers are widely used for packaging various
products. The compressive strength of corrugated fiberboard determines
the compressive strength of the corrugated container, which is
one of the most important required properties. To obtain higher
compressive strength, various measures can be taken, such as
raising the basis weight, adding more kraft pulp or using more
fluting medium. However these measures generally increase the
Here we report the results of our study on flute structure with
a view to improving the edgewise compression strength of corrugated
fiberboard without increasing costs. Our method is to simulate
the deformation behavior of an edgewise crush test (ECT) using
finite element method (FEM). In our study, the compressive strength
of corrugated fiberboard was estimated through the following
Firstly, the compressive strengths (Sc) of the liner and the
fluting medium were ascertained by carrying out short-span compression
tests (SCTs). Next, these SCTs were simulated, then the maximum
equivalent stress at the point at which the model reached Sc
was regarded as the failure criterion. The compressive strength
of the corrugated fiberboard was assumed to be equal to the reaction
force at the point at which the liner or the fluting medium reached
the failure criterion in the ECT simulation. In the FEM simulation,
nonlinear structural analysis was carried out under the assumption
that both the liner and the fluting medium behave as orthotropic
elastic-plastic materials. The model of corrugated fiberboard
was constructed of shell elements.
On the other hand, a series of experimental corrugated fiberboards
with various flute shapes (U-shape, V-shape, UV-shape and so
on) were prepared, then their edgewise compression strengths
As a result, the V-shape with the larger glue width was found to have the most
advantageous flute structure in terms of strength and cost.
fiberboard, Finite element method, Flute structure, Edgewise compression
Edgewise crush test, Short-span compression
Characteristic Mechanical Properties of Washi Papers
Tatsuo Yamauchi and Naoharu Usami
Graduate School of Agriculture, Kyoto University
Comparing with commercial papers from wood pulp, Japanese traditional
papers, washi from kozo fibers show the following features; Washi
generally gives thin paper sheet relating to its low basis weight.
Sheet density and elastic modulus of washi are low, showing poor
fiber-fiber bonding. However in-plane mechanical properties of
washi are superior to those of wood pulp papers, especially tear
strength and folding endurance are enormously excellent。 On the
other hand out-of-plane mechanical property such as peeling strength
at paper failure is poor for washi.
Keywords: Density, Fiber-fiber
bonding, Kozo fiber, Mechanical properties, Washi